JP2005159945A - Circularly polarized antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circularly polarized antenna device in which a radiating conductor plate is miniaturized, dielectric loss is small, and performance is excellent. <P>SOLUTION: This antenna device is provided with a dielectric substrate 3 provided on a ground conductor plate 1, a plurality of electrodes 5 provided on the dielectric substrate 3 and facing the ground conductor 1 to form a capacitor, a radiating conductor plate 7 made of a metal plate disposed on the dielectric substrate 3 with a predetermined distance, and a plurality of leg pieces 10 bent from a plurality of locations of this conductor plate 7 toward the dielectric substrate 3. The conductor plate 7 has two of first and second different electric lengths generated in directions perpendicular to each other through a center C, each of the leg pieces 10 is connected to each of the electrodes 5 and an area of each of the electrodes 5 is made equal. Thus, a capacitor is formed by the electrodes 5 and the ground conductor 1, the resonant frequency is reduced, and the radiating conductor plate is miniaturized. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a patch-type circularly polarized antenna device suitable for use in a GPS antenna or the like.

  FIG. 6 is a perspective view of a conventional circularly polarized antenna device. Next, the configuration of the conventional circularly polarized antenna device will be described with reference to FIG. 6. A dielectric substrate made of an insulating material having a large plate thickness. A patterned ground conductor 52 is provided on the lower surface of 51, and a patterned radiation conductor 53 is provided on the upper surface of the dielectric substrate 51.

  The radiating conductor 53 has a substantially square shape, has a power feeding portion 54 protruding from one side, and is provided with a circularly polarized wave cut portion 53a at the opposite corner, so that the conventional circularly polarized wave is provided. A mold antenna device is formed. (For example, see Patent Document 1)

  However, in such a conventional circularly polarized antenna device, the antenna efficiency is reduced due to the dielectric loss due to the dielectric substrate 51, and the radiation conductor 53 has a rectangular shape, so that the whole becomes large, It was not suitable for downsizing.

JP 2002-237714 A

  The conventional circularly polarized antenna device has a reduced antenna efficiency due to dielectric loss due to the dielectric substrate 51, and the radiating conductor 53 has a rectangular shape. There is a problem.

  Accordingly, an object of the present invention is to provide a circularly polarized antenna device that can reduce the size of a radiating conductor plate, reduce dielectric loss, and has good performance.

  As a first means for solving the above problems, a dielectric substrate provided on a ground conductor, and a plurality of electrodes provided on the dielectric substrate and forming a capacitor facing the ground conductor; A radiation conductor plate made of a metal plate arranged at a predetermined interval on the dielectric substrate, and a plurality of leg pieces bent toward the dielectric substrate from a plurality of locations of the radiation conductor plate, The radiating conductor plate has two first and second electrical lengths generated in directions orthogonal to each other through the center, and the leg pieces pass through the center of the radiating conductor plate and are orthogonal to each other. In the place except for the central part of the radiation conductor plate on the first and second lines, there are four leg pieces each provided on the first and second lines. Each is connected to an individual said electrode and said first The area of the electrode to which the two leg pieces provided above are connected is equal to the area of the electrode to which the two leg pieces provided on the second line are connected. .

Further, as a second solution, the rectangular radiation conductor plate is provided with a cut-off portion at a corner located on one diagonal, and the first and second generated in the radiation conductor plate. The electrical length was made different.
Further, as a third solving means, the rectangular radiating conductor plate is located on one diagonal line, and a hole is provided between a center and a corner of the radiating conductor plate, and the radiating conductor plate The first and second electric lengths generated in the above are made different.

As a fourth solution, the ground conductor is formed of a ground conductor plate made of a metal plate larger than the radiation conductor plate.
Further, as a fifth solving means, the four leg pieces are provided at the same distance from the center of the radiation conductor plate.

As a sixth solving means, the leg piece is provided along the outer peripheral edge of the radiation conductor plate.
As a seventh solution, the leg piece is provided at a position closer to the center than the outer peripheral edge of the radiation conductor plate.
Further, as an eighth solving means, a circuit board is provided, and the circuit board is constituted by the dielectric substrate on which electronic components are mounted.

A circularly polarized antenna device according to the present invention includes a dielectric substrate provided on a ground conductor, a plurality of electrodes provided on the dielectric substrate and forming a capacitor facing the ground conductor, and the dielectric substrate. A radiating conductor plate made of a metal plate disposed at a predetermined interval on the radiating conductor plate, and a plurality of leg pieces bent toward the dielectric substrate from a plurality of locations of the radiating conductor plate. The two first and second electrical lengths generated in the directions orthogonal to each other are different, and the leg pieces pass through the center of the radiation conductor plate and radiate conductors on the first and second lines orthogonal to each other. Except for the central part of the plate, it has four leg pieces, two on each of the first and second lines, each leg piece being connected to an individual electrode, The area of the electrode to which the two leg pieces provided on the first line are connected, and the second line Two leg provided is a structure in which equal the area of the electrodes to be connected.
Thus, since the capacitor is formed by the electrode and the ground conductor, the resonance frequency is lowered, and the radiation conductor plate can be reduced in size.
In addition, since the areas of the electrodes connected to the leg pieces are equal, and the two first and second electric lengths of the radiating conductor plate are made different to obtain circularly polarized waves, the configuration is simple and the productivity is improved. A good one is obtained.
In addition, since the dielectric substrate may be as thin as a circuit board, the influence of dielectric loss can be suppressed as much as possible, and a good performance can be obtained, and the leg pieces are soldered to the electrodes. By simply doing this, the radiation conductor plate can be attached and connected to the electrode, and a product with good productivity and low cost can be obtained.

  Further, the rectangular radiation conductor plate is provided with a cut-off portion at a corner located on one diagonal line, and the first and second electric lengths generated in the radiation conductor plate are made different. A simple product with good productivity can be obtained.

  Further, the rectangular radiating conductor plate is located on one diagonal line, and a hole is provided between the center and the corner of the radiating conductor plate, so that the first and second electric power generated in the radiating conductor plate are formed. Since the lengths are made different, the structure is simple and a product with good productivity can be obtained.

  Further, since the ground conductor is formed of a ground conductor plate made of a metal plate larger than the radiation conductor plate, an inexpensive metal plate such as an iron plate can be used as the ground conductor plate, and an inexpensive one can be obtained.

  Further, since the four leg pieces are provided at the same distance from the center of the radiation conductor plate, the distance from the center of the radiation conductor plate to the tip of the leg piece can be made equal, and the electrical characteristics are stabilized. be able to.

  Further, since the leg pieces are provided along the outer peripheral edge of the radiation conductor plate, a radiation conductor plate having a large area can be obtained.

  In addition, since the leg piece is provided at a position closer to the center than the outer peripheral edge of the radiating conductor plate, the leg piece made of a bent piece can be formed by cutting from the outer peripheral edge of the radiating conductor plate, and the material is good and inexpensive. Can be obtained.

  It also has a circuit board, and this circuit board is composed of a dielectric board on which electronic components are mounted. Therefore, the circuit board can be placed between the radiating conductor plate and the ground conductor plate, has a good space factor, and is downsized. Can be planned.

  FIG. 1 is a plan view according to a first embodiment of the circularly polarized antenna device of the present invention, and FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a plan view of the ground conductor plate according to the first embodiment of the circularly polarized antenna device of the present invention, and FIG. 5 is the circularly polarized wave of the present invention. It is a top view which concerns on 2nd Example of a type | mold antenna apparatus.

  Next, the configuration of the first embodiment of the circularly polarized antenna device according to the present invention will be described with reference to FIGS. 1 to 4. A ground conductor plate 1 made of a metal plate as a ground conductor is particularly shown in FIG. Thus, it has the bending piece 1a bent upwards in the four directions, and the escape hole 1b provided in several places including the position adjacent to this bending piece 1a.

  The rectangular circuit board 2 includes a dielectric substrate 3 made of an insulating plate, a wiring pattern 4 provided on the dielectric substrate 3, and a plurality of first and second electrodes provided at four corners of the dielectric substrate 3. 2, second and third electrodes 5a, 5b, 5c and 5d.

  The areas of the first to fourth electrodes 5a to 5d are formed to be equal, and the dielectric substrate 3 is provided at a plurality of locations including the first to fifth electrodes 5a to 5d. Through holes 3a.

An electronic component 6 including a dielectric filter or the like is mounted on the circuit board 2 to form a desired electric circuit including a matching circuit, a filter circuit, an amplifier circuit, and the like.
In such a circuit board 2, the lower surface of the circuit board 2 is placed on the ground conductor plate 1 with the bent piece 1 a inserted through the through hole 3 a, and the bent piece 1 a is soldered to the wiring pattern 4. In addition, the circuit board 2 is supported by the bent piece 1a.

  Further, when the circuit board 2 is mounted on the ground conductor plate 1, the first to fourth electrodes 5 a to 5 d face the ground conductor plate 1 with the dielectric substrate 3 interposed therebetween, and capacitors are formed respectively. It will be in the state.

  As shown particularly in FIG. 1, the radiation conductor plate 7 made of a substantially square (quadrangle) metal plate has first and second lines S1 and S2 orthogonal to each other through a center C. A cut portion 8 for circularly polarized waves provided at a corner located on the line S1 (on one diagonal line), and one power feeding portion 9 formed of a bent piece cut downward.

 The power feeding unit 9 has a position shifted by 45 degrees with respect to the first and second lines S1 and S2, and the first and second lines S1 and S2 directions become the electric field direction. A first electrical length is generated in the direction of the line S1, and a second electrical length is generated in the direction of the second line S2, so that the first and second electrical lengths in the radiation conductor plate 7 are The first electrical length is smaller than the second electrical length.

The radiating conductor plate 7 is located on the third and fourth lines S3 and S4 that pass through the center C and are orthogonal to each other, and on the third and fourth lines S3 and S4 at a place excluding the central portion. It has four leg pieces 10a, 10b, 10c, and 10d provided between the outer peripheral edges.
The third and fourth lines S3 and S4 are shifted by 45 degrees with respect to the first and second lines S1 and S2.

The four leg pieces 10a to 10d are formed by being bent downward at a position where the distance from the center C is equal, and provided at a position closer to the center C than the outer peripheral edge 7a.
Further, the electric field strength of the radiation conductor plate 7 is in a strong state at the outer peripheral portions on the first and second lines S1 and S2, but the leg pieces 10a to 10d are in the first and second lines. It is in a state of being provided at a location where the electric field strength is relatively weak apart from S1 and S2.

  In this embodiment, the leg pieces 10a to 10d are described as being provided closer to the center C than the outer peripheral edge 7a. However, the leg pieces 10a to 10d may be provided along the outer peripheral edge 7a. good.

  The radiating conductor plate 7 has a protruding portion at the tip of the feeding portion 9 and a protruding portion at the tip of the leg pieces 10a to 10d inserted into the through hole 3a of the dielectric substrate 3, and the feeding portion 9 is connected to the wiring pattern. 4 and the leg pieces 10a to 10d are respectively soldered to the first to fourth electrodes 5a to 5d.

  At this time, the first to fourth electrodes 5a to 5d are opposed to the ground conductor plate 1 with the dielectric substrate 3 interposed therebetween to form a capacitor, and the leg pieces 10a to 10d and the power feeding unit 9 are escaped. The hole 1b is not connected to the ground conductor plate 1.

  The radiating conductor plate 7 attached to the circuit board 2 in this way is arranged in parallel with the ground conductor plate 1 and the circuit board 2 at a predetermined interval, and the radiating conductor plate 7 has a first electric power. The length is determined by the length of the radiation conductor plate 7 on the first line S1 and the capacitance of the capacitor formed by the first and second electrodes 5a and 5b. The length is determined by the length of the radiation conductor plate 7 on the second line S2 and the capacitance of the capacitor formed by the third and fourth electrodes 5c and 5d.

  In this embodiment, the capacities of the capacitors formed by the first to fourth electrodes 5a to 5d are equal, but the first and second electric lengths generated in the radiation conductor plate 7 are different. Since there is a difference between the first and second electrical lengths on the second lines S1 and S2, a circularly polarized antenna device can be obtained.

When the radiating conductor plate 7 is attached, the ground conductor plate 1 having a larger area than the radiating conductor plate 7 exists in the entire lower part, and the radiating conductor plate 7 and the ground conductor plate 1 are radiated between them. In this state, the circuit board 2 is located in the plane area of the conductor plate 7.
By providing the length of the radiation conductor plate 7 on the first and second lines S1 and S2 and the capacitance of the first to fourth electrodes 5a to 5d, the frequency can be lowered, and the circularly polarized antenna The device can be miniaturized.

  FIG. 5 shows a second embodiment of the circularly polarized antenna device according to the present invention. The configuration of the second embodiment will be described. The radiation conductor plate 7 of the second embodiment has a second configuration passing through the center C. On the second second line S2, a hole 7b is provided between the center C and the corner so that the first and second electrical lengths of the radiating conductor plate 7 are different from each other. By providing, the second electrical length is larger than the first electrical length.

  Other configurations are the same as those in the first embodiment, and the same parts are denoted by the same reference numerals, and the description thereof is omitted here.

  In the above-described embodiment, the description has been given of the case where one power feeding unit is provided. However, it is needless to say that two power feeding units may be provided.

The top view which concerns on 1st Example of the circularly polarized wave type antenna apparatus of this invention. Sectional drawing in the 2-2 line of FIG. Sectional drawing in the 3-3 line of FIG. The top view of the grounding conductor board which concerns on 1st Example of the circularly polarized wave type antenna apparatus of this invention. The top view which concerns on 2nd Example of the circularly polarized wave type antenna apparatus of this invention. The perspective view of the conventional circularly polarized wave type antenna apparatus.

Explanation of symbols

1: Ground conductor plate (ground conductor)
DESCRIPTION OF SYMBOLS 1a: Bending piece 1b: Escape hole 2: Circuit board 3: Dielectric board | substrate 3a: Through-hole 4: Wiring pattern 5a: 1st electrode 5b: 2nd electrode 5c: 3rd electrode 5d: 4th electrode 6: Electronic component 7: Radiation conductor plate 7a: Outer peripheral edge 8: Cut-off part 9: Feeding part 10a: Leg piece 10b: Leg piece 10c: Leg piece 10d: Leg piece C: Center S1: First line S2: Second Line S3: third line S4: fourth line

Claims (8)

A dielectric substrate provided on the ground conductor, a plurality of electrodes provided on the dielectric substrate and forming a capacitor opposite to the ground conductor, and disposed on the dielectric substrate at a predetermined interval And a plurality of leg pieces bent toward the dielectric substrate from a plurality of locations of the radiation conductor plate, the radiation conductor plate extending in a direction perpendicular to the center. The two generated first and second electrical lengths are different, and the leg piece passes through the center of the radiation conductor plate and is centered on the radiation conductor plate on the first and second lines orthogonal to each other. The four leg pieces are provided on each of the first and second lines, and the leg pieces are connected to the individual electrodes, and The two leg pieces provided on the first line are connected to each other. And poles of the area, a circularly polarized wave antenna device in which two of said leg pieces is provided is characterized in that equal the area of the electrode connected to the second line. The rectangular radiating conductor plate is provided with a cut-off portion at a corner located on one diagonal line so that the first and second electrical lengths generated in the radiating conductor plate are different. The circularly polarized antenna device according to claim 1. The rectangular radiating conductor plate is located on one diagonal line, and a hole is provided between a center and a corner of the radiating conductor plate, and the first and second generated in the radiating conductor plate. The circularly polarized antenna device according to claim 1, wherein the electrical lengths of the antennas are different. The circularly polarized antenna device according to any one of claims 1 to 3, wherein the ground conductor is formed of a ground conductor plate made of a metal plate larger than the radiation conductor plate. The circularly polarized antenna device according to any one of claims 1 to 4, wherein the four leg pieces are provided at positions at equal distances from the center of the radiation conductor plate. 6. The circularly polarized wave antenna device according to claim 1, wherein the leg pieces are provided along an outer peripheral edge of the radiation conductor plate. 6. The circularly polarized wave antenna device according to claim 1, wherein the leg piece is provided at a position closer to the center than the outer peripheral edge of the radiation conductor plate. The circularly polarized antenna device according to claim 1, further comprising a circuit board, the circuit board being configured by the dielectric substrate on which electronic components are mounted.

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